Rotary cutter



Oct. 21, 1941; c. w. DIECKMANN 2,259,623

ROTARY CUTTER Filed oep 14, 1940 Patented Oct. 21, 1941 UNITED `-sfr-.arres `,wir1.21m'- o-FF-ice 'l I 2,259,623," i j f .1Q ROTARY CUTTER Charles W. Dieckmann, Chicago, Ill.

Application October 14, 1940, Serial No. 361,098

2 Claims.

The invention relates to cutters for rotary meat grinders which comprises a spider and knife blade secured to the spider and rotating across a stationary perforated plate.

One object of the invention is to provide simple eicient and improved means for securing the knife blades in the spider.

Other objects of the invention will appear from the detailed description.

The invention consists in the several novel features which are hereinafter set forth and are more particularly defined by claims at the conclusion hereof.

In the drawing: Fig. 1 is a fragmentary longitudinal section of a meat cutter embodying the invention. Fig. 2 is a transverse section taken on line 2-2 of Fig- 1. Fig. 3 is a section on an enlarged scale through one of the spider arms and a knife and the perforated plate taken on lines 3-3 of Fig. 2. Fig. 4 is a perspective of one of the knife blades. Fig. 5 is an outer side elevation of a portion of the spider.

The invention is exemplified in a machine comprising a cylinder II through which the meat to be ground is advanced by a screw I2 which is rotatable in the cylinder and driven by any suitable means, as well understood in the art. A perforated plate I3 which coacts with the knives is mounted in the discharge end of cylinder I I. The shaft I 'I of the feed screw is journaled in a sleeve I4 which is carried by the plate I3. Shaft I'I is provided with a polygonal portion which extends through a correspondingly polygonal opening in a spider I9 which is provided with a hub and radial arms 23 to which the knives 2l are respectively secured. The knives 2I rotate across the inner face of plate I3 to cut the meat and discharge it through the perforations in said plate, as well understood in the art.

Each knife 2l is individually secured to one of the spider arms 20. Each knife is stamped from a plate of metal and comprises a front portion 22 having a cutting edge 23 which is adapted to engage the perforated plate. Front portion 22 extends angularly from the face of plate I3. Each knife blade also comprises an integral portion 2Q which, in cross-section, is angled or oblique relatively to blade portion 23 and to the inner face of perforated plate I3.

Each arm 23 is provided with an inclined bearing face 23 against which the rear face of the blade portion 24 abuts. Each spider arm is provided with a portion 21 which extends around the trailing edge of the knife and overlaps a por- Each spider arm is provided with a radially extending channel 28 between the projecting portion 21 and the face 26 into which the trailing portion of the knife blade fits, so that the trailing portion of the blade will be confined transversely between the face 26 and portion 2l of the spider arm. The portion 21 laps the front face of the trailing portion of the knife so that the knife will be held atwise against the inclined face 26 of the spider arm. Each knife is formed of hardened metal and provided with a hole 29 which extends transversely therethrough. A screw 32 is threaded to a hole which passes through the spider arm transversely of the blade and is provided with a tapered end 3| which is adapted to engage one side of the hole 29 in the blade. The angle of the conical end of the screw relatively to the blade is such that the greater component of force applied to the blade by the screw will be toward the bottom 33 of channel 28 in the arm. As a result the trailing edge of the knife will be forced by the wedging engagement of the screw side of the hole 29 firmly against the bottom 33 of the channel 23 and the entire knife will be iixedly secured to the spider arm for rotation with the spider. In operation, the pressure onr the blades will force them against the front face 26 of the arm.

This construction exemplifies extremely simple means for eiiiciency and individually securing or jamming the knife blades in the radial channels in the spider arms and for quickly securing the knives in the spider arms and for easy replacement in the event of excessive wear or breakage.

This application is a continuation in part of patent No. 2,250,753 dated July 29, 1941.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

1. A rotary cutter for a meat grinder comprising a knife blade having a cutting edge at the front end thereof and a hole extending transversely therethrough, a rotatable spider provided with a hub and a radial arm extending outwardly from the hub, the arm having a front face fitting against the back face of the blade and a radially extending channel along its rear margin, with a bottom face against which the rear edge of the knife fabuts, and a front side fitting against the tion of the front face of portion 24 of the blade. 55 front face of the rear portion of the blade, and

a screw threaded to the arm having its axis extending transversely of the blade from the back rface of and through the arm, and provided with hub and an arm extending radially outwardly" from the hub, the arm having a front face tting against the back face of the blade and a radially extending channel along its rear margin, with a bottom face against which the rear edge of the knife abuts, and a front side fitting against the frontr face of the rear portion of the blade, and a screw threaded to the arm, having its axis extending transversely of the blade from the back face 3of and through the arm and provided with an integral tapered end extending into and having wedging engagement with the side of the hole in the blade and adapted to jam the rear edge Hof* the blade against the bottom of the groove.

CHARLES W. DIECKMANN. 

